05000346/FIN-2009006-01
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Finding | |
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Title | Failure to evaluate molded case circuit breakers that exceed their qualified life |
Description | The inspectors identified a Non-Cited Violation (NCV) of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Actions, for the failure to promptly identify and correct a condition adverse to quality regarding the expired qualification of molded case circuit breakers as safety-related components. Specifically, the licensee failed to identify that unqualified safety-related molded case circuit breakers were a condition adverse to quality and, as a result, the corrective actions were not prompt in that a 6 year replacement frequency was specified without an evaluation as to the acceptability of that frequency. The licensee entered this issue into its corrective action program. The inspectors determined that the finding was more than minor because the finding, if left uncorrected, would become a more significant safety concern. The finding screened as of very low safety significance (Green) because the finding was a qualification deficiency confirmed not to have resulted in loss of operability or functionality in service. This finding has a cross-cutting aspect in the area of human performance, decision making, because the licensee made a nonconservative determination that unqualified breakers were not a condition adverse to quality based on anecdotal history that suggested that no known problem existed at the time with any specific breaker. H.1(b |
Site: | Davis Besse |
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Report | IR 05000346/2009006 Section 4OA2 |
Date counted | Jun 30, 2009 (2009Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | A Wilson R Lerch F Tran N Feliz J Cameron P Voss L Jones |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Davis Besse - IR 05000346/2009006 | ||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2009Q2
Self-Identified List (Davis Besse)
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